JPH02138783A - Method and device for determining moment of changeover of system for active thermal stabilization of cavity length of frequency stability laser - Google Patents
Method and device for determining moment of changeover of system for active thermal stabilization of cavity length of frequency stability laserInfo
- Publication number
- JPH02138783A JPH02138783A JP63301104A JP30110488A JPH02138783A JP H02138783 A JPH02138783 A JP H02138783A JP 63301104 A JP63301104 A JP 63301104A JP 30110488 A JP30110488 A JP 30110488A JP H02138783 A JPH02138783 A JP H02138783A
- Authority
- JP
- Japan
- Prior art keywords
- laser
- active thermal
- frequency
- thermal stabilization
- cavity length
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000006641 stabilisation Effects 0.000 title claims abstract description 33
- 238000011105 stabilization Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 13
- 230000001419 dependent effect Effects 0.000 claims description 13
- 230000010287 polarization Effects 0.000 abstract description 8
- 230000004913 activation Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 9
- 230000000087 stabilizing effect Effects 0.000 description 7
- 230000005855 radiation Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/139—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は測定のためのレーザの製造において使用される
周波数安定レーザの共振器長のアクティブ熱安定化のた
めのシステムの切換えの瞬間を決定するための方法およ
び装置に関するものである。Detailed description of the invention [Industrial field of application] The present invention determines the switching moment of a system for active thermal stabilization of the cavity length of frequency stabilized lasers used in the production of lasers for measurements. The present invention relates to a method and apparatus for doing so.
［従来の技術］
周波数安定レーザの共振器長のアクティブな熱安定化の
ためのシステムの切換えの瞬間が最初の切換えの瞬間後
に経過した経験的に最適化された時間後に決定されるよ
うな周波数安定レーザの共振器長をアクティブに熱安定
化するためのシステムの切換えの瞬間を決定するための
方法が知られている（Ｊ、 １． ｏｆ ａｐｐｌｉ
ｅｄ Ｐｈ 、 １９巻１１号２１８１〜２１８５
頁参照）。[Prior Art] System for active thermal stabilization of the cavity length of a frequency-stabilized laser at a frequency such that the switching moment is determined after an empirically optimized time elapsed after the first switching moment Methods are known for determining the switching moment of a system for active thermal stabilization of the cavity length of a stable laser (J, 1. of appli
ed Ph, Volume 19, No. 11, 2181-2185
(see page).
周波数安定レーザの共振器長をアクティブに熱安定化す
るためのシステムの切換えの瞬間を決定するための既知
の方法の欠点は、レーザ放射の周波数の再現性を減少し
、レーザがｒｅｇｌＩＩｌｅ内に入っている間の動作位
置における熱変化および空気の対流の変化を考慮しない
ので、安定化の状態に入る後に周囲の温度における許容
可能な変化範囲が減少することである。The disadvantages of known methods for determining the switching moment of systems for actively thermally stabilizing the cavity length of frequency-stabilized lasers are that they reduce the frequency reproducibility of the laser radiation and that the laser enters the reglIIle. Because it does not take into account thermal changes in the operating position and air convection changes during the stabilization period, the range of permissible changes in ambient temperature after entering the stabilization state is reduced.
また別の方法として、切換え後にレーザ管供給状態が連
続して１ｌｌｌＪ定されレーザ共振器温度に依存する電
気信号が取出され、それは支持電気信号と比較され、周
波数安定レーザの共振器長のアクティブな熱安定化のた
めのシステムが両信号が均等化したときに切換えられる
ような周波数安定レーザのための共振器長をアクティブ
に熱安定化するためのシステムの切換えの瞬間を決定す
るための方法が知られている。レーザ共振器の温度に依
存する電気信号は共振器に取付けられている熱感知素子
によって生成される。Alternatively, after switching, the laser tube supply state is continuously determined by 1llllJ and an electrical signal dependent on the laser cavity temperature is extracted, which is compared with the supporting electrical signal and the active signal of the cavity length of the frequency stabilized laser is extracted. A method for determining the switching moment of a system for actively thermally stabilizing the cavity length for a frequency stabilized laser is such that the system for thermally stabilizing is switched when both signals are equalized. Are known. An electrical signal dependent on the temperature of the laser cavity is generated by a heat sensing element attached to the cavity.
（５ｏｒｏ −Ｆ ｒａｎｃｅ −Ｍｅｔｒｉｌａｓ
Ｍ、 １００１ ＥＭａｎｕｅｌ ｄ ｕｔ！１ｌ
ｓａＨｏｎ ｅｔ ｄｅ ｍａｉｎｔｅｎａｎｃ
ｅ１９７６参照）
周波数安定レーザの共振器長をアクティブ熱安定化する
ためのシステムのスイッチングの瞬間を決定するための
この既知の方法の欠点は、レーザの切換えの瞬間に周囲
の温度のインパクトを考慮しないため、再現性を減少し
その体制へ入るための時間が増加することである。(5oro-France-Metrilas
M, 1001 EManuel d ut! 1l
sahon et de maintenanc
The disadvantage of this known method for determining the switching moment of a system for active thermal stabilization of the cavity length of a frequency-stable laser is that it does not take into account the impact of the ambient temperature on the switching moment of the laser. This reduces reproducibility and increases the time to enter the regime.
周波数安定レーザの共振器長をアクティブに熱安定化す
るためのシステムの切換えの瞬間を決定するためのこの
第２の既知の装置は比較器を具備し、その出力は周波数
安定レーザの共振器長をアクティブに熱安定化するだめ
のシステムの宿り御入力と接続される。その第１の入力
はレーザ共振器の温度に依存する電気信号を発生する装
置と接続される。その第２の入力は支持信号源と接続さ
れる。レーザ共振器の温度に依存する電気信号を発生す
る装置は電圧分割器中に設けられている熱抵抗によって
生成される。熱抵抗はレーザ管上に取付けられる。This second known device for determining the switching moment of a system for actively thermally stabilizing the cavity length of a frequency-stable laser comprises a comparator, the output of which is equal to the cavity length of the frequency-stable laser. The active thermal stabilization device is connected to the input of the system. Its first input is connected to a device that generates an electrical signal dependent on the temperature of the laser cavity. Its second input is connected to a support signal source. A device for generating an electrical signal that is dependent on the temperature of the laser cavity is generated by a thermal resistor provided in the voltage divider. A thermal resistor is mounted on the laser tube.
周波数安定レーザの共振器長をアクティブに熱安定化す
るためのシステムのスイッチングの瞬間を決定するため
の既知の装置の欠点は、この装置がレーザ共振器の常に
同じ温度で周波数安定レーザの共振器長のアクティブ熱
安定化のためのシステムを切換えるので、レーザ放射線
の設定された周波数に入るための時間がレーザの切換え
の瞬間の動作位置における周囲の温度の値に依存するこ
とである。The disadvantage of the known device for determining the switching moment of the system for actively thermally stabilizing the cavity length of frequency-stabilized lasers is that this device does not allow the resonator of frequency-stabilized lasers to always be at the same temperature of the laser cavity. Because of the long switching system for active thermal stabilization, the time to enter the set frequency of the laser radiation is dependent on the value of the ambient temperature at the operating position at the moment of switching of the laser.
［発明の解決すべき課題］
本発明の目的は周波数安定レーザの共振器長のアクティ
ブ熱安定化のためのシステムの切換えの瞬間を決定する
ための方法および装置において、それはその体制に入る
期間中温度および空気の対流の変化と、レーザ安定化の
その体制に入るだめの時間の減少と、レーザの切換えの
瞬間での周囲の温度の値とに依存せずに安定化する体制
に入った後に、レーザ放射線周波数の再現性における増
加および周囲の温度における許容可能な変化における増
加を確立することである。[Problem to be Solved by the Invention] The object of the present invention is a method and a device for determining the switching moment of a system for active thermal stabilization of the cavity length of a frequency stabilized laser, which during the period of entering the regime. After entering the stabilizing regime, independent of changes in temperature and air convection and the reduction of the time for entering that regime of laser stabilization and the value of the ambient temperature at the moment of switching of the laser. , to establish an increase in the reproducibility of the laser radiation frequency and an increase in the acceptable variation in ambient temperature.
［課題解決のための手段および作用コ
この目的は、切換え後に、レーザ管の供給状態が連続的
に支持電気信号と比較されるレーザ共振器の温度に依存
する電気信号を測定され、周波数安定レーザの共振器長
をアクティブ熱安定化するためのシステムは両信号が等
しくなったときに切換えられる周波
数安定レーザのための共振器長をアクティブ熱安定化す
るためのシステムの切換えの瞬間を決定するための方法
によって達成される。レーザ共振器の温度に依存する電
気信号はその７Ｒ度−Ｌ昇速度に比例している。[Means and effects for solving the problem] The purpose is to measure the temperature-dependent electrical signal of the laser resonator, in which, after switching, the supply state of the laser tube is continuously compared with the supporting electrical signal, and the frequency-stable laser To determine the switching moment of the system for active thermal stabilization of the cavity length for a frequency stabilized laser, the system for active thermal stabilization of the cavity length is switched when both signals become equal. This is achieved by the following method. The temperature-dependent electrical signal of the laser cavity is proportional to its 7R degrees-L rise rate.
本発明の目的はまた比較器を具備し、前記方法を実施す
る周波数安定レーザの共振器長をアクティブ熱安定化す
るためのシステムの切換えの瞬間を決定するための装置
によって達成され、比較器の出力は周波数安定レーザた
めの共振器長をアクティブ熱安定化するためのシステム
の制御入力と接続される。その第１の入力はレーザ共振
器の温度に依存した電気信号を生成する装置と接続され
る。その第２の入力は支持信号源と接続される。The object of the invention is also achieved by a device for determining the switching moment of a system for active thermal stabilization of the cavity length of a frequency-stabilized laser implementing the method, comprising a comparator; The output is connected to the control input of a system for active thermal stabilization of the cavity length for frequency stabilized lasers. Its first input is connected to a device that generates an electrical signal dependent on the temperature of the laser cavity. Its second input is connected to a support signal source.
レーザ共振器の温度に依存した電気信号を発生する装置
は周波数安定レーザの共振器長をアクティブ熱安定化す
るためのシステムの２つの光受信器から形成され、一方
比較器の第１の入力との接続は差動増幅器、成形器およ
び積分器の直列接続を介して行われる。The device for generating an electrical signal dependent on the temperature of the laser cavity is formed by two optical receivers of the system for active thermal stabilization of the cavity length of a frequency stabilized laser, while the first input of the comparator and The connection is made through a series connection of a differential amplifier, a shaper and an integrator.
本発明に従った周波数安定レーザのレーザ共振器長をア
クティブ熱安定化するためのシステムの切換えの瞬間を
決定するための方法および装置の利点は、体制に入る時
間を減少させることができると共にその体制に入る期間
と温度および空気の対流における変化に依存せずに、レ
ーザ放射周波数の再現性の増加および安定化の体制に入
った後に動作位置の周囲の温度の変化における許容範囲
の増加である。The advantage of the method and device for determining the switching moment of a system for active thermal stabilization of the laser cavity length of a frequency-stable laser according to the invention is that it can reduce the regime time and that An increase in the reproducibility of the laser emission frequency and an increase in the tolerance in changes in the temperature surrounding the operating position after entering the regime of stabilization, independent of changes in temperature and air convection during the period of entry into the regime .
［実施例］
本発明を図面に示された実施例によって更に詳細に説明
する。[Example] The present invention will be explained in more detail by means of an example shown in the drawings.
周波数安定レーザの共振器長をアクティブ熱安定化する
ためのシステムの切換えの瞬間を決定するための装置は
比較器１を具備し、その出力は周波数安定レーザ１２の
共振器のアクティブ熱安定化のだめの装置２の制御入力
と接続され、装置２の出力はレーザ管３の熱素子と接続
され、それは偏光分割器４を経て、その後方に配置され
た光受信器５および６に光学的に接続される。光受信器
５および６は増幅器７および８を経て周波数安定レーザ
の共振器のアクティブ熱安定化のための装置２と電気的
に接続される。比較器１の第１の入力は光受信器５およ
び６の出力と直列に接続された差動増幅器９、成形器ｌ
Ｏおよび積分器１１を経て接続される。比較器１の第２
の入力は電源Ｇと接続される。レーザ管３、共振器のア
クティブ熱安定化のための装置２、偏光分割器４、光受
信器５および６、および増幅器７および８は周波数安定
レーザ１２の共振器長のアクティブ熱安定化のためのシ
ステムを形成する。The device for determining the switching moment of the system for active thermal stabilization of the cavity length of a frequency-stable laser 12 comprises a comparator 1 whose output is connected to the active thermal stabilization of the cavity of the frequency-stable laser 12. The output of the device 2 is connected to the thermal element of the laser tube 3, which is optically connected via a polarization splitter 4 to the optical receivers 5 and 6 arranged behind it. be done. The optical receivers 5 and 6 are electrically connected via amplifiers 7 and 8 to the device 2 for active thermal stabilization of the resonator of a frequency-stable laser. A first input of the comparator 1 is a differential amplifier 9 connected in series with the outputs of the optical receivers 5 and 6, a shaper l
0 and an integrator 11. 2nd of comparator 1
The input of is connected to power supply G. Laser tube 3 , device 2 for active thermal stabilization of the cavity, polarization splitter 4 , optical receivers 5 and 6 and amplifiers 7 and 8 for active thermal stabilization of the cavity length of frequency stabilized laser 12 form a system of
周波数安定レーザの共振器部分の長さのアクティブ熱安
定化のだめのシステムの切換えの瞬間を決定するための
装置の動作は以下の通りである。The operation of the apparatus for determining the switching moment of a system of active thermal stabilization reservoirs of the length of the cavity section of a frequency stabilized laser is as follows.
最初にレーザ管３の供給源が切換えられる。レーザ共振
器の後部ミラーのレーザ放射は偏光分割器４で分割され
、光受信器５および６へ入る。レーザ管３は内部ミラー
および不定偏光を存する。偏光分割器４はレーザ管３に
関して調整され、光受信器５および６からの信号はレー
ザ管３の共振器の長さの変化におけるレーザ放射の両方
の偏光強度における変化に対応し、結果として温度歪み
を生じる。レーザ管３の放電の開始および最大パワーを
角゛する加熱器の切換え後に、レーザ共振器長は増加し
始めるか、その速度は徐々に減少する。First the source of the laser tube 3 is switched. The laser radiation of the rear mirror of the laser cavity is split in a polarization splitter 4 and passes into optical receivers 5 and 6. The laser tube 3 has internal mirrors and undefined polarization. The polarization splitter 4 is adjusted with respect to the laser tube 3 and the signals from the optical receivers 5 and 6 correspond to changes in the intensity of both polarizations of the laser radiation on changes in the length of the resonator of the laser tube 3 and, as a result, in the temperature causes distortion. After the start of the discharge of the laser tube 3 and the switching of the heater to the maximum power, the laser cavity length begins to increase or its speed gradually decreases.
光受信器５および６からの電気信号は周期的である。そ
れらの周期はレーザ管３の共振器の熱膨張の速度におけ
る減少に比例して増加している。先受信器後の信号は演
算増幅器７および８によって増幅され、差動増幅器９の
両入力へ送られる。差動増幅器９の入力でレーザ放射の
両部光の強度に対応する信号ＡおよびＢが入力する。両
信号ＡおよびＢの差は成形器１０に入るが、一方バイボ
ーラ信号Ｅが形成され積分器１１によって積分される。The electrical signals from optical receivers 5 and 6 are periodic. Their period increases in proportion to the decrease in the rate of thermal expansion of the resonator of the laser tube 3. The post-pre-receiver signal is amplified by operational amplifiers 7 and 8 and sent to both inputs of differential amplifier 9. At the input of the differential amplifier 9 are input signals A and B corresponding to the intensities of both beams of laser radiation. The difference between both signals A and B enters a shaper 10, while a bipolar signal E is formed and integrated by an integrator 11.
後者の積分器１１は正信号に対しては非常に小さい時定
数を有し、−力負信号に対しては時定数はｔ−（１５〜
３０）秒である。比較器１は積分器１１の出力信号Ｆの
レベルを受け、それが支持電圧源によって予めセットさ
れたレベルＧに到達するとアクティブ熱安定化のための
システムを具備する周波数安定レーザ１２の共振器のア
クティブ熱安定化のための装置２の切換えのため信号Ｈ
を発生する。従ってレーザ１２は周囲の媒体の温度、空
気の対流およびその体制に入る間のそれらの変化に依存
せずに常に同じ速度で安定化する体制へ入る。The latter integrator 11 has a very small time constant for positive signals, and for negative signals the time constant is t-(15~
30) seconds. The comparator 1 receives the level of the output signal F of the integrator 11 and, when it reaches the level G preset by the support voltage source, activates the resonator of the frequency stabilized laser 12 with a system for active thermal stabilization. Signal H for switching device 2 for active thermal stabilization
occurs. Laser 12 thus enters the regime stabilizing at the same rate at all times, independent of the temperature of the surrounding medium, air convection, and their changes during entry into the regime.
この速度は一般に毎分６乃至８λ／２であり、ここでは
λは使用されたレーザ管３の波長である。This speed is generally between 6 and 8 λ/2 per minute, where λ is the wavelength of the laser tube 3 used.
第１図は周波数安定レーザの共振器長のアクティブ熱安
定化のためのシステムを切換える瞬間を決定するための
装置のブロック図である。
第２図は装置の特徴的な点における信号の時間図を表わ
す。
１・・・比較器、２・・・共振器、３・・・レーザ管、
４・・・偏光分割器、５，６・・・光受信器、７，８増
幅器、９・・・差動増幅器、ＩＯ・・・成形器、１１・
・・積分器、１２・・・周波数安定レーザ。
出願人代理人 弁理士 鈴江武彦FIG. 1 is a block diagram of a device for determining the switching moment of a system for active thermal stabilization of the cavity length of a frequency-stable laser. FIG. 2 represents the time diagram of the signals at characteristic points of the device. 1... Comparator, 2... Resonator, 3... Laser tube,
4... Polarization splitter, 5, 6... Optical receiver, 7, 8 amplifier, 9... Differential amplifier, IO... Shaper, 11.
... Integrator, 12... Frequency stable laser. Applicant's agent Patent attorney Takehiko Suzue
Claims (2)
号と比較されるレーザ共振器の温度に依存する電気信号
を測定され、周波数安定レーザの共振器長のアクティブ
熱安定化のための装置が両信号が等しくなったときに切
換えられる、周波数安定レーザの共振器長のアクティブ
熱安定化のためのシステムの切換えの瞬間を決定するた
めの方法において、 レーザ共振器の温度に依存する電気信号がその温度増加
の速度に比例することを特徴とする方法。(1) After switching the laser tube, the temperature-dependent electrical signal of the laser cavity is measured, which is compared with the supporting electrical signal according to the supply conditions, and the device for active thermal stabilization of the cavity length of the frequency-stabilized laser is installed on both sides. In a method for determining the switching moment of a system for active thermal stabilization of the cavity length of a frequency-stable laser, which is switched when the signals become equal, an electrical signal that is dependent on the temperature of the laser cavity is A method characterized in that it is proportional to the rate of temperature increase.
共振器長のアクティブ熱安定化のための装置の制御入力
と接続され、その第１の入力がレーザ共振器の温度に依
存する電気信号を発生する装置と接続され、一方その第
２の入力が支持信号源と接続されている、周波数安定レ
ーザの共振器長のアクティブ熱安定化のためのシステム
の切換えの瞬間を決定するための装置において、 レーザ共振器の温度に依存する電気信号を発生する装置
が周波数安定レーザの共振器長をアクティブ熱安定化す
るための装置の２つの受信器によって構成され、これら
受信器の比較器の第１の入力との接続は直列接続された
差動増幅器、成形器および積分器を経て行われることを
特徴とする請求項１記載の方法を実施するための装置。(2) comprising a comparator, the output of which is connected to the control input of a device for active thermal stabilization of the cavity length of a frequency-stabilized laser, the first input of which is an electric current dependent on the temperature of the laser cavity; for determining the switching moment of a system for active thermal stabilization of the cavity length of a frequency-stabilized laser, connected to a device for generating a signal, while a second input thereof is connected to a supporting signal source; In the device, the device for generating an electrical signal dependent on the temperature of the laser cavity is constituted by two receivers of the device for active thermal stabilization of the cavity length of the frequency-stabilized laser, and the comparator of these receivers is 2. Device for carrying out the method according to claim 1, characterized in that the connection to the first input is made via a series connected differential amplifier, shaper and integrator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BG82012A BG47632A1 (en) | 1987-11-30 | 1987-11-30 | Method and device for determining moment of switching of system for active thermostabilizing of resonator lenght in frequency stabilized lasers |
| BG82012 | 1987-11-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02138783A true JPH02138783A (en) | 1990-05-28 |
Family
ID=3919801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63301104A Pending JPH02138783A (en) | 1987-11-30 | 1988-11-30 | Method and device for determining moment of changeover of system for active thermal stabilization of cavity length of frequency stability laser |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4908829A (en) |
| JP (1) | JPH02138783A (en) |
| CN (1) | CN1035589A (en) |
| BG (1) | BG47632A1 (en) |
| DE (1) | DE3840255A1 (en) |
| FR (1) | FR2623947B3 (en) |
| GB (1) | GB2212973A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6324404B1 (en) * | 1991-12-26 | 2001-11-27 | Sycord Limited Partnership | Cellular telephone system that uses position of a mobile unit to make call management decisions |
| US5392303A (en) * | 1993-03-30 | 1995-02-21 | Nec Corporation | Frequency stabilization method of semiconductor laser, frequency-stabilized light source and laser module |
| JP3218999B2 (en) * | 1996-12-18 | 2001-10-15 | 安藤電気株式会社 | External cavity type tunable semiconductor laser light source |
| JP3466441B2 (en) * | 1997-11-10 | 2003-11-10 | 株式会社ミツトヨ | Laser device wavelength stabilization device |
| US6120190A (en) * | 1997-11-26 | 2000-09-19 | Lasertron, Inc. | Spatially variable bandpass filter monitoring and feedback control of laser wavelength especially in wavelength division multiplexing communication systems |
| CN106383346B (en) * | 2016-09-14 | 2019-04-02 | 深圳天眼激光科技有限公司 | Pulse laser scan echo receives circuit, method of reseptance and pulse type laser scanner |
| JP2019087550A (en) * | 2017-11-01 | 2019-06-06 | 株式会社ミツトヨ | Laser device and laser stabilization method |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3042666C2 (en) * | 1980-11-12 | 1985-10-10 | Moskovskoe vysšee techničeskoe učilišče imeni N.E. Baumana, Moskva | Laser spectrophone for analyzing gases |
| DD203435A1 (en) * | 1982-02-01 | 1983-10-19 | Adw Ddr | ARRANGEMENT FOR STABILIZING THE RESONATOR LENGTH MODERN SYNCHRONIZED GAS LASER |
| JPS58176988A (en) * | 1982-04-09 | 1983-10-17 | Olympus Optical Co Ltd | Semiconductor laser temperature control apparatus |
| JPS6021582A (en) * | 1983-07-15 | 1985-02-02 | Fuji Photo Film Co Ltd | Device for laser temperature adjustment |
| US4834477A (en) * | 1984-07-05 | 1989-05-30 | Ricoh Company, Ltd. | Method of controlling the temperature of semiconductor laser in an optical device |
| JPS61189657A (en) * | 1985-02-18 | 1986-08-23 | Fuji Photo Film Co Ltd | Semiconductor element temperature controller |
| JPS61189658A (en) * | 1985-02-18 | 1986-08-23 | Fuji Photo Film Co Ltd | Semiconductor element temperature controller |
| US4701607A (en) * | 1985-04-15 | 1987-10-20 | Arel Control Systems, Ltd. | Temperature control laser detection apparatus |
| US4631728A (en) * | 1985-07-22 | 1986-12-23 | The United States Of America As Represented By The Secretary Of The Navy | Thermoelectric cooler control circuit |
| EP0238484A1 (en) * | 1985-09-24 | 1987-09-30 | Bell Communications Research, Inc. | Temperature stabilization of injection lasers |
| GB8621037D0 (en) * | 1986-08-30 | 1986-10-08 | Renishaw Plc | Pre-heat control system |
| DE3706635A1 (en) * | 1987-03-02 | 1988-09-15 | Spindler & Hoyer Kg | Method for stabilising the frequency of a laser diode independently of the diode current |
-
1987
- 1987-11-30 BG BG82012A patent/BG47632A1/en unknown
-
1988
- 1988-11-23 US US07/276,212 patent/US4908829A/en not_active Expired - Fee Related
- 1988-11-25 FR FR888815454A patent/FR2623947B3/en not_active Expired - Fee Related
- 1988-11-25 GB GB8827638A patent/GB2212973A/en not_active Withdrawn
- 1988-11-29 DE DE3840255A patent/DE3840255A1/en not_active Withdrawn
- 1988-11-30 JP JP63301104A patent/JPH02138783A/en active Pending
- 1988-11-30 CN CN88108201A patent/CN1035589A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US4908829A (en) | 1990-03-13 |
| FR2623947B3 (en) | 1990-03-02 |
| BG47632A1 (en) | 1990-08-15 |
| CN1035589A (en) | 1989-09-13 |
| DE3840255A1 (en) | 1989-06-08 |
| FR2623947A1 (en) | 1989-06-02 |
| GB8827638D0 (en) | 1988-12-29 |
| GB2212973A (en) | 1989-08-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3133411B2 (en) | Stabilizing apparatus and method for SFS | |
| US5204867A (en) | Method and apparatus to dynamically control the resonator gain of a laser | |
| EP0196856B1 (en) | Dual-wavelength laser apparatus | |
| JPH02138783A (en) | Method and device for determining moment of changeover of system for active thermal stabilization of cavity length of frequency stability laser | |
| JP2644315B2 (en) | High frequency discharge pumped laser device | |
| CA1045234A (en) | Laser amplifier system | |
| JPH06196795A (en) | Stabilizing device of sfs background and its method | |
| US5926495A (en) | Laser diode pump wavelength sensing and control apparatus and method | |
| GB1320967A (en) | Laser system comprising means for controlling the frequency of a laser beam | |
| US4949345A (en) | Method and apparatus for reducing the effect of random polarization on the power/energy output of lasers | |
| US6034977A (en) | Optical path difference control system and method for solid state lasers | |
| JPH02299277A (en) | Method and apparatus for stabilizing optical component temperature | |
| JP2003075877A (en) | Laser light source and temperature control method for nonlinear optical element | |
| JPH0246787A (en) | Pulse oscillation solid-state laser device | |
| US4998254A (en) | Stabilized synchronously pumped dye laser | |
| JP2584209B2 (en) | Laser output control device | |
| JP3465048B2 (en) | Optical amplification method, optical amplification device, and optical resonator for optical amplification | |
| JPH0416031B2 (en) | ||
| JPS60217679A (en) | Laser output controller | |
| WO1988001798A1 (en) | Pre-heat control system for a laser | |
| KR950002067B1 (en) | Second harmonic generator | |
| CA1139869A (en) | Laser control apparatus | |
| JPH0456479B2 (en) | ||
| GB2217101A (en) | Metal vapour laser device | |
| JP3333242B2 (en) | Pulse laser beam amplification method and amplification device |